//
//  Copyright (C) 2010 Vadim Ushakov
// 
//  This program is free software; you can redistribute it and/or modify it
//  under the terms of the GNU General Public License as published by the Free
//  Software Foundation; either version 2 of the License, or (at your option)
//  any later version.
// 
//  This program is distributed in the hope that it will be useful, but
//  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
//  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
//  for more details.
//  
//  You should have received a copy of the GNU General Public License along
//  with this program; if not, write to the Free Software Foundation, Inc.,
//  59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
//

#ifndef _ARCHINTERLOCKED_H
#define _ARCHINTERLOCKED_H

#include "processor.h"

static inline int machInterlockedCompareExchange(volatile int* Destination, const int Exchange, const int Comperand)
{
	int retval = Comperand;
	__asm__(
		"lock; cmpxchgl %k[Exchange], %[Destination]"
		: [retval] "+a" (retval)
		: [Destination] "m" (*Destination), [Exchange] "q" (Exchange)
		: "memory");
	return retval;
}

static inline int machWaitForInterlockedCompareExchange(volatile int* Destination, const int Exchange, const int Comperand)
{
	while(1)
	{
		// Trying to acquire the lock
		if (machInterlockedCompareExchange(Destination, Exchange, Comperand) == Comperand)
			break;

		while (*Destination != Comperand)
		{
			_machProcessorPause();
		}
	}
	return Comperand;
}

#endif/*_ARCHINTERLOCKED_H*/




